function SDmenu(id){
	if (!document.getElementById || !document.getElementsByTagName)
		return false;
	this.menu = document.getElementById(id);
	this.submenus = this.menu.getElementsByTagName("div");
	this.remember = true;
	this.speed = 5;
	this.markCurrent = true;
	this.oneSmOnly = true;
}
	SDmenu.prototype.init = function(){
		var mainInstance = this;
		for(var i = 0; i < this.submenus.length; i++){
		this.submenus[i].getElementsByTagName("span")[0].onclick = function() {
				mainInstance.toggleMenu(this.parentNode);		
			};
		}
		if (this.markCurrent) {
		var links = this.menu.getElementsByTagName("a");
		for (var i = 0; i < links.length; i++)
			if (links[i].href == document.location.href) {
				links[i].className = "current";
				break;
			}
		}
		
	};

	SDmenu.prototype.toggleMenu = function(submenu){
	if (submenu.className == "collapsed"){
		this.expandMenu(submenu);
	}
	else{
		this.collapseMenu(submenu);
		}
	};
	SDmenu.prototype.expandMenu = function(submenu) {
	var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
	var links = submenu.getElementsByTagName("a");
	for (var i = 0; i < links.length; i++)
		fullHeight += links[i].offsetHeight;
	var moveBy = Math.round(this.speed * links.length);
	var mainInstance = this;

	var intId = setInterval(function() {
		var curHeight = submenu.offsetHeight;
		var newHeight = curHeight + moveBy;
		if (newHeight < fullHeight)
			submenu.style.height = newHeight + "px";
		else {
			clearInterval(intId);
			submenu.style.height = "";
			submenu.className = "";
			mainInstance.memorize();
		}
	}, 30);
	this.collapseOthers(submenu);
	};
	SDmenu.prototype.collapseMenu = function(submenu) {
		var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
		var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length);
		var mainInstance = this;
		var intId = setInterval(function() {
			var curHeight = submenu.offsetHeight;
			var newHeight = curHeight - moveBy;
			if (newHeight > minHeight)
				submenu.style.height = newHeight + "px";
			else {
				clearInterval(intId);
				submenu.style.height = "";
				submenu.className = "collapsed";
				mainInstance.memorize();
			}
		}, 30);
	};
	SDmenu.prototype.collapseOthers = function(submenu) {
		if (this.oneSmOnly) {
			for (var i = 0; i < this.submenus.length; i++)
				if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed")
					this.collapseMenu(this.submenus[i]);
		}
	};
	SDmenu.prototype.expandAll = function() {
		var oldOneSmOnly = this.oneSmOnly;
		this.oneSmOnly = false;
		for (var i = 0; i < this.submenus.length; i++)
			if (this.submenus[i].className == "collapsed")
				this.expandMenu(this.submenus[i]);
		this.oneSmOnly = oldOneSmOnly;
	};
	SDmenu.prototype.collapseAll = function() {
		for (var i = 0; i < this.submenus.length; i++)
			if (this.submenus[i].className != "collapsed")
				this.collapseMenu(this.submenus[i]);
	};
	SDmenu.prototype.memorize = function() {
	if (this.remember) {
		var states = new Array();
		for (var i = 0; i < this.submenus.length; i++)
			states.push(this.submenus[i].className == "collapsed" ? 0 : 1);
		var d = new Date();
		d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
		document.cookie = "sdmenu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + "; expires=" + d.toGMTString() + "; path=/";
	}
	};
